2014-07-14T20:28:55ZFluxBBhttp://www.mathisfunforum.com/viewtopic.php?id=21227Yes, it's correct. Just plug in the values for x and y in the equations to check.]]>http://www.mathisfunforum.com/profile.php?id=975782014-07-14T20:28:55Zhttp://www.mathisfunforum.com/viewtopic.php?pid=325016#p325016I need some help with substitution.